Vaadin Util - UI Event Bus

[javier-godoy]

The following utility methods (inspired by https://cookbook.vaadin.com/ui-eventbus) allow dynamically registering a UI event bus that is active while the component is attached, and triggering events against such event bus.

public static <T extends ComponentEvent<?>> void addUIListener(Component component, Class<T> eventType,
        ComponentEventListener<T> listener) {
    component.addAttachListener(ev -> {
        Registration registration = ComponentUtil.addListener(ev.getUI(), eventType, listener);
        component.addDetachListener(event -> registration.remove());
    });
}

public static void fireUIEvent(ComponentEvent<?> event) {
    UI ui = event.getSource().getUI().get();
    ComponentUtil.fireEvent(ui, event);
}

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